Rayleigh Light Scattering for Concentration Measurements in Turbulent Flows.
Rayleigh Light Scattering for Concentration Measurements
in Turbulent Flows.
Pitts, W. M.
National Aeronautics and Space Administration/Lewis
Research Center. Rayleigh Scattering Diagnostics
Workshop. Scientific and Technical Information Program.
NASA Conference Publication 10186. July 25-26, 1995,
Cleveland, OH, 69-87 pp, 1996.
light scattering; concentration measurements;
concentration fluctuations; flow fields; flow
measurement; line cameras; rayleigh light scattering;
turbulent jets; axisymmetric jets; scalar dissipation
Despite intensive research efforts over a number of
years, an understanding of scalar mixing in turbulent
flows remains elusive. An understanding is required
because turbulent mixing has a pivotal role in a wide
variety of natural and technologically important
processes. As an example, the mixing and transport of
pollutants in the atmosphere and bodies of water are
often dependent on turbulent mixing processes.
Turbulent mixing is also central to turbulent combustion
which underlies most hydrocarbon energy utiliztion in
modern socities as well as unwanted fire behavior.
Development of models for combusting flows is crucial
for more efficient utilization of limited hydrocarbon
fuel resources, reduction in environmentally harmful
pollutants, more efficient chemical processes, and for
the prediction of hazard associated with unwanted fire.
However, an understanding of scalar mixing is required
before useful models of turbulent mixing and,
ultimately, turbulent combustion can be developed.